If One with the Stars enchants an enchantment that has no other card types, the enchanted permanent won’t be affected.

The enchanted permanent keeps its abilities but has no power or toughness. If one of its abilities refers to them, it uses 0.

The enchanted permanent loses any subtypes associated with the card types it lost. It keeps any supertypes, such as legendary.

One with the Stars may enchant a permanent that is only temporarily a creature, such as a Vehicle. If this happens, One with the Stars’s effect causes the enchanted permanent to remain an enchantment even after the temporary effect expires.